The total results count is notoriously inaccurate, so don't expect any precision.
To give an example, Google recently countered MSN's beta search engine with the
announcement of their index nearly doubling.
Searches for "the" returned 11 billion pages, well over the 8,058,044,651 they claim to search on their home page but this was corrected after search engine watchdogs noted it.
The homepage text is not dynamic, and thusly not accurate. The total results number
is dynamic, but is not accurate either.